Jacki Kelley, CEO for North America and president of global clients at IPG Mediabrands, has moved into a new role at parent company Interpublic Group, according to people familiar with the matter.

IPG recently lost a small slice of the Microsoft media business but won the larger creative and digital accounts after a massive, cross-agency pitch. Ms. Kelley, who led the pitch for the holding company, is now helping with the transition.

While that Microsoft transition is not a permanent gig, IPG has offered Ms. Kelley a new position working within the broader IPG network on business development opportunities that require different agencies to collaborate, according to people familiar wtih the matter.

A handful of holding companies have leaders overseeing account work that brings together multiple agencies, and the model is gaining momentum. WPP has arguably been the most aggressive with its dedicated-agency strategy, having built a team early on for Ford and more recently for Chanel and United Airlines, among others. The company has a dedicated person -- George Rogers, director of global business development -- leading that charge.

It's unclear whether or not Ms. Kelley will take the job on offer at Interpublic. Both she and IPG declined to comment on the role.

Mediabrands, the media agency group at Interpublic, is not looking to name a successor to Ms. Kelley and instead plans to divide her duties between the individual agency CEOs.

"In the interim, with Jacki's move to IPG, our media agency brand leadership teams in North America will manage direct connections with global clients based in North America," Matt Seiler, CEO of Mediabrands, said in a statement. "Global client leads at the agencies will also be closely aligned with the brand leaders and the North American COO -- ensuring further consistency, efficiency and accountability across the network."

The group separately has hired Chris Loll to succeed Mediabrands North America COO Guy Beach. Mr. Beach is stepping up into the newly created role of global chief commercial officer. Mr. Loll was managing director of the New York office at Wunderman, a WPP agency. "Guy will work closely with Global Client Finance, the Global Account and Business Leads, and New Business to ensure that we are delivering the most value for our clients and for our network across all areas of opportunity," Mediabrands said in an internal memo. "He will also partner with Magna Global to craft smarter, more aggressive deals with media owners, and devise more proactive approaches to client service solutions, including pay-for-performance and other contract models."

Magna Global is a media buying arm of Mediabrands, which also includes the networks Initiative, UM and BPN.

The Mediabrands memo came from Greg Walsh, yet another recently promoted Mediabrands exec; he was elevated to global CFO from North American CFO. Mr. Walsh assumed the global duties that had been handled by Jeff Lupinacci, who recently left to take on a CFO role at Iconix Brand Group.

A raft of changes won't be much of a departure for Mediabrands. Ms. Kelley moved into her role there last February after serving as global CEO of UM, one of many shifts at the media agency group last year. It also promoted Initiative's Jim Hytner into an international Mediabrands role, hired former Microsoft Chief Creative Officer Gayle Troberman to help market the group, and recruited Facebook's former global agency team director, Sarah Personette, for a senior post at UM.